Year Number 2004-01-01 0 2005-01-01 0 2006-01-01 0 2007-01-01 0 2008-01-01 0 2009-01-01 0 2010-01-01 0 2011-01-01 0 2012-01-01 0 2013-01-01 15 2014-01-01 683 2015-01-01 23830 2016-01-01 55705